<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var obj = {
            name : "永恩",
            num : 4,
            family : "brother",
            sex : "man",
            A:function(){alert("121212")}
        }
        for(var b in obj)console.log(b)
    </script>
</body>
</html>